Monica Seles, the former world No. 1 tennis player and nine-time Grand Slam champion, has publicly revealed her diagnosis with myasthenia gravis, a rare autoimmune neuromuscular disease. She was diagnosed three years ago and has since experienced symptoms including muscle weakness and double vision, which affect her daily life. Myasthenia gravis is a lifelong condition that causes voluntary muscles to weaken easily after use. Seles first noticed symptoms while playing tennis, and she has spoken openly about the challenges posed by the disease. Her disclosure highlights the impact of this rare condition on a prominent sports figure's life and career.